Shelf



FIG. 1 is a top perspective view of the shelf showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a back perspective view thereof;

FIG. 4 is a left side elevation view, the right side elevation being the mirror image thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof.

FIG. 7 is a back elevation view thereof; and,

FIG. 8 is a front elevation view thereof. 

CLAIM The ornamental design for a shelf, as shown and described. 